Hi, I have a (Kenmore Elite) 665.77979K702 with the seal leaking for the diverter. The seal was not available but the old seal has the number; BA 10-18-4 molded on it. It measures 10 mm ID, 18 mm OD, and 4 mm thick. I found the equivalent part at a local bearing shop. It is made by DMR OIL SEALS and is part no. 10184-DL. It was $3 Canadian. It is installed (with a little silicone grease) and it appears to have fixed the leak.